title: Synthesis and molluscicidal activity of some new thiophene, thiadiazole and pyrazole derivatives.
abstract: The base-catalyzed reaction of benzoyl acetone 1 with phenyl isothiocyanate yields the non-isolable intermediate 2. Treatment of 2 with dilute HCl afforded the corresponding thiocarbamoyl derivative 3. Reaction of the intermediate 2 with phenacyl bromide, ethyl bromoacetate, chloroacetonitrile, chloroacetyl chloride, bromodiethyl malonate and chloroacetone afforded the corresponding thiophene derivatives 5, 8, 15 and 17. The thiocarbamoyl derivative 3 reacts with arylazophenacyl bromide and/or hydrazine hydrate to afford the corresponding thiadiazole and pyrazole derivatives 20a-c and 22, respectively. These new synthesized compounds show generally a moderate molluscicidal activity to Biomphalaria alexandrina snails.
authors.affiliation: Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt. afadda2@yahoo.com
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Fadda
authors.forename: E
authors.initials: E
authors.lastname: Abdel-Latif
authors.forename: Rasha E
authors.initials: RE
authors.lastname: el-Mekawy
mesh_terms: D000818:Animals; D001700:Biomphalaria / Q000187:drug effects*; D011720:Pyrazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013057:Spectrum Analysis / Q000379:methods; D013830:Thiadiazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013876:Thiophenes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology
chemical_list: D011720:Pyrazoles; D013830:Thiadiazoles; D013876:Thiophenes